Control valve features

1. There are various types of control valves, and their applicable occasions are different. Therefore, the type of control valve should be reasonably selected according to the requirements of the process production process.
2. Pneumatic control valves are divided into two categories: air-opening and air-closing. The air-to-open control valve is closed in a fault state, and the air-to-close control valve is opened in a fault state. Some auxiliary equipment can be used to form a position protection valve or to make the control valve self-locking, that is, the control valve maintains the valve opening before the failure when the failure occurs.
3. The air opening and air closing methods can be realized through the combination of forward and reverse actuator types and forward and reverse valves. When using a valve positioner, it can also be realized through a valve positioner.
4. Various control valves have different structures and have their own characteristics.